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witwatersrand gold mines

  • Witwatersrand Gold Fields: Geology, Genesis, and Exploration

    2000年1月1日  Gold has been produced from seven major gold fields located around the northern and western margin of the 350-km-long Witwatersrand basin. Each gold field The Witwatersrand plateau consists of a 5000-to-7000-metre-thick (3.1–4.3 mi) layer of mainly sedimentary rocks laid down over a period of about 260 million years, starting approximately 2.97 billion years ago. The entire series of rocks, known as the "Witwatersrand Supergroup," consists of very hard erosion resistant quartzites, banded ironstones and some marine lava deposits, interspersed with softer, more easily eroded tillites, mudstones and conglomerates. The oldest rocWitwatersrand - WikipediaThe Witwatersrand rocks overlie rocks of the Dominion Reef System, underlie those of the Ventersdorp System, and occur in an east-west band from Randfontein to Springs and Witwatersrand System Gold-bearing, Supergroup, Basin

  • Witwatersrand gold deposits formed by volcanic rain, anoxic rivers

    2015年2月2日  Gold in the Witwatersrand is enriched to mineable concentrations in thin quartz pebble beds (‘reefs’) that commonly extend over kilometres.2000年1月1日  The Witwatersrand gold fields of South Africa account for more than a third of the world’s total gold pro- duction since mining started there in 1886: 48,000 t Au. Witwatersrand gold fields: Geology, genesis and explorationThe first recorded discovery of gold on the Witwatersrand was made by Jan Gerrit Bantjes in June 1884, on the farm Vogelstruisfontein, and was followed soon thereafter, in Discovery of the Gold in 1884 South African History Online

  • Witwatersrand South Africa, Map, History Britannica

    Its rich gold deposits, occurring in conglomerate beds known as reefs, were discovered in 1886. A heavy in-migration of miners followed, and the city of Johannesburg grew near 2013年6月1日  Descriptions of the Witwatersrand goldfields have invoked superlatives around themes including great wealth, huge depths, giant mines and innovative Witwatersrand gold: Discovery matters - G. N. Phillips, 2013

    • “خدمة الرعاية لدينا ، تصنيع سعر القلب الدقيق ، العملاء في سهولة.”

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